FAN 15 Four Pure Shifted Pungs (48 points)
Four Pungs or Kongs in the same suit, each shifted one up from the last.

source: Mahjong Greenbook MCR Rules 2014 (pdf)
Four Pungs or Kongs in the same suit, each shifted one up from the last.
source: Mahjong Greenbook MCR Rules 2014 (pdf)